Synthesis of Efficient and Stable Tetrabutylammonium Copper Halides with Dual Emissions for Warm White Light-Emitting Diodes

In order to achieve a high color-rendering index (CRI) and low correlated color temperature (CCT) indoor lighting, single-component phosphors with broad-band dual emission are in high demand for white-light-emitting diodes (WLEDs). However, phosphors with such fluorescent properties are rare at present. Herein, we report a facile solid-state chemical method for the synthesis of single-component phosphor with broad-band emission and a large Stokes shift that can meet the requirements of future white-light sources. These new tetrabutylammonium copper halides phosphors have excellent warm white emission characteristics, and their luminescence peaks are located at 494 and 654 nm. The optimized photoluminescence (PL) quantum yield can reach 93.7 %. The typical CIE coordinate of the as-fabricated WLED is at (0.3620, 0.3731) with a CRI of 89 and low CCT of 4516 K.

Automated summary

This research reports a facile solid-state chemical method for synthesizing a single-component phosphor with broad-band emission and a large Stokes shift to meet the requirements of future white-light sources. The newly developed tetrabutylammonium copper halides phosphors exhibit excellent warm white emission with peaks at 494 and 654 nm. The optimized photoluminescence quantum yield can reach 93.7%. The fabricated WLED shows a typical CIE coordinate of (0.3620, 0.3731) with a CRI of 89 and low CCT of 4516 K.